What's next for the iPhone? In the three years since Apple's iconic device made its debut, it's quickly attracted a host of competitors, scrambling to match its sharp design, ease of use and hugely popular App Store model.

Yahoo got on the iPhone bandwagon early and, as Enterprise Mobile Today reports, continues to develop and enhance services for the device, the latest being an enhanced version of Yahoo Messenger.

Yahoo, one of the earliest supporters of the iPhone, continues to advance its Messenger App for the popular mobile device.

Tuesday Yahoo (NASDAQ: YHOO) announced it added several features to Messenger including the ability to make free video and voice calls to contacts using the VoIP technology built into Yahoo Messenger.